19497403735849 has 8 divisors (see below), whose sum is σ = 21113210677832. Its totient is φ = 17898169173120.

The previous prime is 19497403735811. The next prime is 19497403735891. The reversal of 19497403735849 is 94853730479491.

It can be written as a sum of positive squares in 4 ways, for example, as 2470061719449 + 17027342016400 = 1571643^2 + 4126420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19497403735849 - 2²¹ = 19497401638697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19497403735349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4143092364 + ... + 4143097069.

It is an arithmetic number, because the mean of its divisors is an integer number (2639151334729).

Almost surely, 2^{19497403735849} is an apocalyptic number.

It is an amenable number.

19497403735849 is a deficient number, since it is larger than the sum of its proper divisors (1615806941983).

19497403735849 is a wasteful number, since it uses less digits than its factorization.

19497403735849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286189627.

The product of its (nonzero) digits is 823011840, while the sum is 73.

The spelling of 19497403735849 in words is "nineteen trillion, four hundred ninety-seven billion, four hundred three million, seven hundred thirty-five thousand, eight hundred forty-nine".